igneous
Granite
Phaneritic plutonic igneous rock (SiO2 range 65-75%)
Hardness: 6 to 7 on Mohs scale; Color: mottled grey, white, tan, and dark streaks; Luster: dull to vitreous; Crystal structure: phaneritic (coarse-grained); Specific gravity: 2.65 to 2.75
- Hardness
- 6 to 7 on Mohs scale
- Color
- mottled grey, white, tan, and dark streaks
- Luster
- dull to vitreous
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Physical properties
Hardness: 6 to 7 on Mohs scale; Color: mottled grey, white, tan, and dark streaks; Luster: dull to vitreous; Crystal structure: phaneritic (coarse-grained); Specific gravity: 2.65 to 2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface. This specimen appears to be weathered from an ancient plutonic intrusion, likely spanning hundreds of millions of years in geological age.
Uses & applications
Extensively used in construction, monuments, kitchen countertops, and as crushed stone for road base.
Geological facts
Granite makes up a large portion of the Earth's continental crust. Massive granite formations like El Capitan in Yosemite are world-famous landmarks.
Field identification & locations
Identified by its visible interlocking crystals of quartz, feldspar, and mica. This weathered hand specimen shows typical salt-and-pepper coloration and is found in mountainous regions worldwide.
